Electric switch



' Jul 8 1924.

c. w. MAISON ELECTRIC SWITCH INVENTOR.. C'. "(A/Arse Filed Nov.

M y. F

Patented July 8, 1924.

UNITED STATES CARL W. MATSON, OF WESTPORT, OREGON.

ELECTRIC SWITCH.

Application filed November 27, 1922. Serial No. 603,683.

To all whom it may concern:

I Be it known that I, CARL W. MATSON, a citizen of the United States, and a resident of lVestport,-county of Clatsop, State of Oregon, have invented a new and useful Electric Switch, of which the following is a specification.

The present invention relates to improvements in electric switches and has particular referenceto a switch to be used in combination with an alarm device,-such as an alarm clock, for the purpose of closing an electric circuit when the alarm-device becomes active. The switch may be used for various purposes, as for instance, for closing a circuit including a buzzer, or a plurality of other alarm devices, or a lighting system or similar devices. A particular feature of the invention is the utilizing. of a winding key commonlyused in an alarm clock mechanism for establishing electric contact with a stationary element when the key is revolved, due to the winding off of the alarm. A further feature of my device is the construction of the stationary member in such a manner that no contact will be established when the alarm key is revolved in the opposite direction for the purpose of winding the alarm. Further objects and advantages of my device will appear as the specification proceeds.

The preferred form of the invention is illustrated in the accompanying drawing in which Figure 1 shows a rear'view of an alarm clock having my switch attached thereto; Figure 2 a horizontal section through the rear cover arrangement taken along line IIII of Figure 1; Figure 3 a section taken along line IIIIII of Figure 2; Figure 4 a detail view of a switch element; Figure 5 a detail view of a stud to which the switch element shown in Figure 4 is secured; and Figure 6 a wiring diagram showing a buzzer connected in series with the switch. While I have shown only the preferred form of the invention it should be understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the spirit of the invention.

The alarm clock (1) which may be of any suitable design, and of which a rear view only is shown in the drawing, is provided in the usual manner with a knob (2) for setting the time indicating hands of the clock, the knob (3) for setting the alarm,

shown the socket (7) is screwed on the rod (8) by means of a left-handed thread so that in order to wind the alarm device it is necessary to revolve the socket to the left, while turning the socket to the right will remove the same from the rod (8). The socket (7) is provided with a transverse arm (9) b means of which the same may be rotate Near its end it is grooved as shown at (11) and adapted to receive two semi-circular spring members (12) made of metal and connected by means of theyoke (13) to the wire (14). All the elements described in connection with this key are metallic so as to allow an electric current to pass therethrough.

In operative proximity to the alarm key I provide a threaded stud (16) made of insulating material and secured to the rear cover (17) of the alarm clock by means of a nut (18) cooperating with the head (19) of the stud. The stud which is shown in detail in Figure 5 terminates in a reduced ortion (21) which is provided with a leftand external thread. A. metallic socket (22) shown in detail in Figure 4 is adapted to threadedly engage the reduced end (21) of the stud (16) and is provided with a radially extending metallic arm (23) and a groove (24) adapted to receive the spring members (26) clamped on the groove by means of the yoke (27), which latter connects with the wire (28).

The threaded engagement between the k stud (16) and the socket (22) is arranged. in such a manner that when the socket is screwed tight on the stud its arm (23) extends horizontally to the left as shown in Figure 1, that is into the path of the arm (9) of the alarm key. If the socket is turned to the right through a fraction of a turn its arm (23) clears the arm (9) of the alarm key.

The wiring diagram of Figure 6 shows the wire (14) connecting with one terminal of the battery (29) after passing through the buzzer (31) while the wire (28) connects with the other terminal of the battery.

The'deviceworks as followsz When'it is desired to wind the alarm the socket (22) is turned to the right through a quarter of a turn so as to clear the arm (9) of the alarm key, and the latter may now be turned to the left for the purpose of windingthe alarm. The socket (22) is then turned to the left as far as itwill go, which brings it into the horizontal position shown inFigure 1. Vllhen the alarm device of the alarm clock becomes active the unwinding of the alarm spring causes the alarmkey and the arm (9) to revolve tothe right, and the latter arm will make contact with the arm (23) of the socket' (22) and thereby closes the circuit in which the buzzer (31) is included.

Iclaim:

1. In combination with an alarm clock having a key for winding the alarm when revolved in onedirection adaptedto be revolved in the other direction when the alarm becomes active, a metallic arm extending from the key and a stud of insulating mate rial mounted in operative proximity to the key having a metallic socket threadedly secured thereon with a metallic arm extending from the socket into the path of the key arm when the socket is screwed tight on the stud adapted to be removed from the path of the key arm when the socket is unscrewed through a fraction of a turn.

2. In combination with an alarm clock having a key for winding the alarm when revolved to the left adapted to be revolved to the right when the alarm becomes active, an electric switch comprising a metallic arm extending from the key and a stud of insulating. material mounted in operative proximity to the key having a metallic socket secured thereon by means of a lefthanded thread with a metallic arm extending from the socket into the path of the key arm when the socket is screwed tight on the stud adapted to be removed from the path of the key arm when the socket is unscrewed through a fraction of a turn.

3. In a device of the character described, a switch comprising a rotary switch element having a contact arm thereon and a stationary element having a contact arm threadedly secured thereon, the latter contact arm extending into the path of the former when screwed tight and clearing the same when unscrewed through a fraction of a turn.

CARL W. MATSON.

nab 

